Thank you for the response. Maybe i not explicated my problem very well.It's not a full screen of one color. It's an industrial display and i wish to update strings up to 3 to 4 times per second with a good lisibility. I noticed that when i draw a new string, time to be "clear" is around an half of second.

Would it be possible to share the segments of code that write the pixels and clear the display.

The clear and fill could possibly be sped up by speeding up how fast you write to the display.

The display has a 400 ns Serial clock period, and theoretically you could fill the whole display in about 3ms.If you are calling for delays within the write command this could greatly reduce the time it takes clear or fill the screen.

Hello,It's about the pixel reactivity. I measured with scopemeter and i fill all the screen in about 10 ms. But the pixels that change from clear to black looks leasy (you can see the grey transition). The ones that change from black to clear are fast enough (you don't see the transition).